I use Coloplast Sensura one piece bags. Once in awhile I will have some irritation. In the beginning, while her skin is becoming adapted, she will suffer with this. This is what worked best for me....as I peel off the old appliance, I wipe with a Reliamed adhesive remover wipe. I then use a clean cloth dampened with warm water and a bit of antibacteria soap to wash skin around stoma. Rinse with warm water and dry skin thoroughly. I then use stoma powder, leave on a minute or so and wipe with tissue. Then place the appliance over stoma.
If the skin is greatly irritated, make sure you have an ostomy nurse take a look at it. Sometimes people develop a fungal infection. The skin will improve over time.
Otherwise, how is your daughter feeling? I feel so bad for these young people who are going through this tough time. God bless.